/* * linux/drivers/acorn/scsi/powertec.c * * Copyright (C) 1997-2005 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/blkdev.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/ioport.h> #include <linux/proc_fs.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/dma-mapping.h> #include <asm/dma.h> #include <asm/ecard.h> #include <asm/io.h> #include <asm/pgtable.h> #include "../scsi.h" #include <scsi/scsi_host.h> #include "fas216.h" #include "scsi.h" #include <scsi/scsicam.h> #define POWERTEC_FAS216_OFFSET 0x3000 #define POWERTEC_FAS216_SHIFT 6 #define POWERTEC_INTR_STATUS 0x2000 #define POWERTEC_INTR_BIT 0x80 #define POWERTEC_RESET_CONTROL 0x1018 #define POWERTEC_RESET_BIT 1 #define POWERTEC_TERM_CONTROL 0x2018 #define POWERTEC_TERM_ENABLE 1 #define POWERTEC_INTR_CONTROL 0x101c #define POWERTEC_INTR_ENABLE 1 #define POWERTEC_INTR_DISABLE 0 #define VERSION "1.10 (19/01/2003 2.5.59)" /* * Use term=0,1,0,0,0 to turn terminators on/off. * One entry per slot. */ static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; #define NR_SG 256 struct powertec_info { FAS216_Info info; struct expansion_card *ec; void __iomem *base; unsigned int term_ctl; struct scatterlist sg[NR_SG]; }; /* Prototype: void powertecscsi_irqenable(ec, irqnr) * Purpose : Enable interrupts on Powertec SCSI card * Params : ec - expansion card structure * : irqnr - interrupt number */ static void powertecscsi_irqenable(struct expansion_card *ec, int irqnr) { struct powertec_info *info = ec->irq_data; writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL); } /* Prototype: void powertecscsi_irqdisable(ec, irqnr) * Purpose : Disable interrupts on Powertec SCSI card * Params : ec - expansion card structure * : irqnr - interrupt number */ static void powertecscsi_irqdisable(struct expansion_card *ec, int irqnr) { struct powertec_info *info = ec->irq_data; writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL); } static const expansioncard_ops_t powertecscsi_ops = { .irqenable = powertecscsi_irqenable, .irqdisable = powertecscsi_irqdisable, }; /* Prototype: void powertecscsi_terminator_ctl(host, on_off) * Purpose : Turn the Powertec SCSI terminators on or off * Params : host - card to turn on/off * : on_off - !0 to turn on, 0 to turn off */ static void powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off) { struct powertec_info *info = (struct powertec_info *)host->hostdata; info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0; writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL); } /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs) * Purpose : handle interrupts from Powertec SCSI card * Params : irq - interrupt number * dev_id - user-defined (Scsi_Host structure) */ static irqreturn_t powertecscsi_intr(int irq, void *dev_id) { struct powertec_info *info = dev_id; return fas216_intr(&info->info); } /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type) * Purpose : initialises DMA/PIO * Params : host - host * SCpnt - command * direction - DMA on to/off of card * min_type - minimum DMA support that we must have for this transfer * Returns : type of transfer to be performed */ static fasdmatype_t powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, fasdmatype_t min_type) { struct powertec_info *info = (struct powertec_info *)host->hostdata; struct device *dev = scsi_get_device(host); int dmach = info->info.scsi.dma; if (info->info.ifcfg.capabilities & FASCAP_DMA && min_type == fasdma_real_all) { int bufs, map_dir, dma_dir; bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); if (direction == DMA_OUT) map_dir = DMA_TO_DEVICE, dma_dir = DMA_MODE_WRITE; else map_dir = DMA_FROM_DEVICE, dma_dir = DMA_MODE_READ; dma_map_sg(dev, info->sg, bufs, map_dir); disable_dma(dmach); set_dma_sg(dmach, info->sg, bufs); set_dma_mode(dmach, dma_dir); enable_dma(dmach); return fasdma_real_all; } /* * If we're not doing DMA, * we'll do slow PIO */ return fasdma_pio; } /* Prototype: int powertecscsi_dma_stop(host, SCpnt) * Purpose : stops DMA/PIO * Params : host - host * SCpnt - command */ static void powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) { struct powertec_info *info = (struct powertec_info *)host->hostdata; if (info->info.scsi.dma != NO_DMA) disable_dma(info->info.scsi.dma); } /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host) * Purpose : returns a descriptive string about this interface, * Params : host - driver host structure to return info for. * Returns : pointer to a static buffer containing null terminated string. */ const char *powertecscsi_info(struct Scsi_Host *host) { struct powertec_info *info = (struct powertec_info *)host->hostdata; static char string[150]; sprintf(string, "%s (%s) in slot %d v%s terminators o%s", host->hostt->name, info->info.scsi.type, info->ec->slot_no, VERSION, info->term_ctl ? "n" : "ff"); return string; } /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) * Purpose : Set a driver specific function * Params : host - host to setup * : buffer - buffer containing string describing operation * : length - length of string * Returns : -EINVAL, or 0 */ static int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) { int ret = length; if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) { buffer += 12; length -= 12; if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { if (buffer[5] == '1') powertecscsi_terminator_ctl(host, 1); else if (buffer[5] == '0') powertecscsi_terminator_ctl(host, 0); else ret = -EINVAL; } else ret = -EINVAL; } else ret = -EINVAL; return ret; } /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset, * int length, int host_no, int inout) * Purpose : Return information about the driver to a user process accessing * the /proc filesystem. * Params : buffer - a buffer to write information to * start - a pointer into this buffer set by this routine to the start * of the required information. * offset - offset into information that we have read upto. * length - length of buffer * inout - 0 for reading, 1 for writing. * Returns : length of data written to buffer. */ int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout) { struct powertec_info *info; char *p = buffer; int pos; if (inout == 1) return powertecscsi_set_proc_info(host, buffer, length); info = (struct powertec_info *)host->hostdata; p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION); p += fas216_print_host(&info->info, p); p += sprintf(p, "Term : o%s\n", info->term_ctl ? "n" : "ff"); p += fas216_print_stats(&info->info, p); p += fas216_print_devices(&info->info, p); *start = buffer + offset; pos = p - buffer - offset; if (pos > length) pos = length; return pos; } static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf) { struct expansion_card *ec = ECARD_DEV(dev); struct Scsi_Host *host = ecard_get_drvdata(ec); struct powertec_info *info = (struct powertec_info *)host->hostdata; return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0); } static ssize_t powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct expansion_card *ec = ECARD_DEV(dev); struct Scsi_Host *host = ecard_get_drvdata(ec); if (len > 1) powertecscsi_terminator_ctl(host, buf[0] != '0'); return len; } static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, powertecscsi_show_term, powertecscsi_store_term); static struct scsi_host_template powertecscsi_template = { .module = THIS_MODULE, .proc_info = powertecscsi_proc_info, .name = "PowerTec SCSI", .info = powertecscsi_info, .queuecommand = fas216_queue_command, .eh_host_reset_handler = fas216_eh_host_reset, .eh_bus_reset_handler = fas216_eh_bus_reset, .eh_device_reset_handler = fas216_eh_device_reset, .eh_abort_handler = fas216_eh_abort, .can_queue = 8, .this_id = 7, .sg_tablesize = SG_ALL, .cmd_per_lun = 2, .use_clustering = ENABLE_CLUSTERING, .proc_name = "powertec", }; static int __devinit powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id) { struct Scsi_Host *host; struct powertec_info *info; void __iomem *base; int ret; ret = ecard_request_resources(ec); if (ret) goto out; base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); if (!base) { ret = -ENOMEM; goto out_region; } host = scsi_host_alloc(&powertecscsi_template, sizeof (struct powertec_info)); if (!host) { ret = -ENOMEM; goto out_region; } ecard_set_drvdata(ec, host); info = (struct powertec_info *)host->hostdata; info->base = base; powertecscsi_terminator_ctl(host, term[ec->slot_no]); info->ec = ec; info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET; info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT; info->info.scsi.irq = ec->irq; info->info.scsi.dma = ec->dma; info->info.ifcfg.clockrate = 40; /* MHz */ info->info.ifcfg.select_timeout = 255; info->info.ifcfg.asyncperiod = 200; /* ns */ info->info.ifcfg.sync_max_depth = 7; info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; info->info.ifcfg.disconnect_ok = 1; info->info.ifcfg.wide_max_size = 0; info->info.ifcfg.capabilities = 0; info->info.dma.setup = powertecscsi_dma_setup; info->info.dma.pseudo = NULL; info->info.dma.stop = powertecscsi_dma_stop; ec->irqaddr = base + POWERTEC_INTR_STATUS; ec->irqmask = POWERTEC_INTR_BIT; ecard_setirq(ec, &powertecscsi_ops, info); device_create_file(&ec->dev, &dev_attr_bus_term); ret = fas216_init(host); if (ret) goto out_free; ret = request_irq(ec->irq, powertecscsi_intr, IRQF_DISABLED, "powertec", info); if (ret) { printk("scsi%d: IRQ%d not free: %d\n", host->host_no, ec->irq, ret); goto out_release; } if (info->info.scsi.dma != NO_DMA) { if (request_dma(info->info.scsi.dma, "powertec")) { printk("scsi%d: DMA%d not free, using PIO\n", host->host_no, info->info.scsi.dma); info->info.scsi.dma = NO_DMA; } else { set_dma_speed(info->info.scsi.dma, 180); info->info.ifcfg.capabilities |= FASCAP_DMA; } } ret = fas216_add(host, &ec->dev); if (ret == 0) goto out; if (info->info.scsi.dma != NO_DMA) free_dma(info->info.scsi.dma); free_irq(ec->irq, host); out_release: fas216_release(host); out_free: device_remove_file(&ec->dev, &dev_attr_bus_term); scsi_host_put(host); out_region: ecard_release_resources(ec); out: return ret; } static void __devexit powertecscsi_remove(struct expansion_card *ec) { struct Scsi_Host *host = ecard_get_drvdata(ec); struct powertec_info *info = (struct powertec_info *)host->hostdata; ecard_set_drvdata(ec, NULL); fas216_remove(host); device_remove_file(&ec->dev, &dev_attr_bus_term); if (info->info.scsi.dma != NO_DMA) free_dma(info->info.scsi.dma); free_irq(ec->irq, info); fas216_release(host); scsi_host_put(host); ecard_release_resources(ec); } static const struct ecard_id powertecscsi_cids[] = { { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }, { 0xffff, 0xffff }, }; static struct ecard_driver powertecscsi_driver = { .probe = powertecscsi_probe, .remove = __devexit_p(powertecscsi_remove), .id_table = powertecscsi_cids, .drv = { .name = "powertecscsi", }, }; static int __init powertecscsi_init(void) { return ecard_register_driver(&powertecscsi_driver); } static void __exit powertecscsi_exit(void) { ecard_remove_driver(&powertecscsi_driver); } module_init(powertecscsi_init); module_exit(powertecscsi_exit); MODULE_AUTHOR("Russell King"); MODULE_DESCRIPTION("Powertec SCSI driver"); module_param_array(term, int, NULL, 0); MODULE_PARM_DESC(term, "SCSI bus termination"); MODULE_LICENSE("GPL");